Defines a time change that uses a floating-date rule.
Assembly: System.Core (in System.Core.dll)
'Declaration Public Shared Function CreateFloatingDateRule ( _ timeOfDay As DateTime, _ month As Integer, _ week As Integer, _ dayOfWeek As DayOfWeek _ ) As TimeZoneInfo..::.TransitionTime 'Usage Dim timeOfDay As DateTime Dim month As Integer Dim week As Integer Dim dayOfWeek As DayOfWeek Dim returnValue As TimeZoneInfo..::.TransitionTime returnValue = TimeZoneInfo..::.TransitionTime.CreateFloatingDateRule(timeOfDay, _ month, week, dayOfWeek)
- Type: System.DateTime
The time at which the time change occurs.
- Type: System.Int32
The month in which the time change occurs.
- Type: System.Int32
The week of the month in which the time change occurs.
- Type: System.DayOfWeek
The day of the week on which the time change occurs.
The timeOfDay parameter has a non-default date component.
The timeOfDay parameter does not represent a whole number of milliseconds.
month is less than 1 or greater than 12.
week is less than 1 or greater than 5.
The dayOfWeek parameter is not a member of the DayOfWeek enumeration.
This method creates a floating-date rule (that is, a time change that occurs on a specific day of a specific week of a specific month). For example, a time change that occurs on the last Sunday of October follows a floating-date rule.
The following table indicates how the parameters of the method correspond to the properties of the TimeZoneInfo.TransitionTime object.
The following example creates time zone transitions for an imaginary time zone by using both a fixed-date rule and a floating-date rule. The floating-date rule defines a time zone adjustment that starts at 2:00 A.M. on the last Sunday of March and ends at 3:00 A.M. on the fourth Sunday in October for the years 1956 onward.
' Declare necessary TimeZoneInfo.AdjustmentRule objects for time zone Dim imaginaryTZ As TimeZoneInfo Dim delta As New TimeSpan(1, 0, 0) Dim adjustment As TimeZoneInfo.AdjustmentRule Dim adjustmentList As New List(Of TimeZoneInfo.AdjustmentRule) ' Declare transition time variables to hold transition time information Dim transitionRuleStart, transitionRuleEnd As TimeZoneInfo.TransitionTime ' Define a fictitious new time zone consisting of fixed and floating adjustment rules ' Define fixed rule (for 1900-1955) transitionRuleStart = TimeZoneInfo.TransitionTime.CreateFixedDateRule(#2:00:00AM#, 3, 15) transitionRuleEnd = TimeZoneInfo.TransitionTime.CreateFixedDateRule(#3:00:00AM#, 11, 15) adjustment = TimeZoneInfo.AdjustmentRule.CreateAdjustmentRule(#1/1/1900#, #12/31/1955#, delta, _ transitionRuleStart, transitionRuleEnd) adjustmentList.Add(adjustment) ' Define floating rule (for 1956- ) transitionRuleStart = TimeZoneInfo.TransitionTime.CreateFloatingDateRule(#02:00:00AM#, 3, 5, DayOfWeek.Sunday) transitionRuleEnd = TimeZoneInfo.TransitionTime.CreateFloatingDateRule(#03:00:00AM#, 10, 4, DayOfWeek.Sunday) adjustment = TimeZoneInfo.AdjustmentRule.CreateAdjustmentRule(#01/01/1956#, Date.MaxValue.Date, delta, transitionRuleStart, transitionRuleEnd) adjustmentList.Add(adjustment) ' Create fictitious time zone imaginaryTZ = TimeZoneInfo.CreateCustomTimeZone("Fictitious Standard Time", New TimeSpan(-9, 0, 0), _ "(GMT-09:00) Fictitious Time", "Fictitious Standard Time", _ "Fictitious Daylight Time", adjustmentList.ToArray())
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.